Boletín de aludes

Purcells

Feb 5 – 6, 2016Avalanche Canada
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Archivado · caducó 11 years ago

Peligro de aludes

Sun
Mon
Alta montaña
3 · Notable
Límite del bosque
3 · Notable
Bajo el límite
2 · Moderado
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Lo esencial

New snow, wind and warm temperatures are expected to make for touchy conditions. Small avalanches or cornice failures could step down to a buried persistent weak layer that has recently been responsible for large avalanches around Golden.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    1–3
    Fresh wind slabs have formed below ridge crests and behind cross-loaded terrain features in the alpine and at treeline. Cornices have also been reported to be large and fragile and will continue to lose strength as temperatures rise.

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    3–5
    Low probability high consequence avalanche conditions persist, especially in the Dogtooth Range near Golden. A few close calls (see Avalanche Activity) serve as a warning this layer has teath!

Confidence

Moderate - Freezing levels are uncertain on Monday

Weather Forecast

SATURDAY: Up to 10cm snow overnight, with another 5cm possible thought he day, rain expected at lower elevations, moderate to strong westerly winds, freezing level between 1200 and 1000m. SUNDAY: sunny with cloudy periods, light westerly winds, 1200m freezing level. MONDAY: sunny with cloudy periods, light westerly winds, freezing level between 2500 and 3000m, +5C at 2500m.

Avalanche Summary

We continue to receive reports of natural and skier triggered windslab avalanches from across the region. However, the January surface hoar layer remains the major concern, especially in the north Purcells where it has been responsible for several recent large avalanches. On Saturday a size 3 sledder-triggered avalanche occurred in the Gorman Creek riding area near Golden. Around the same time, a size 3.5 skier-triggered persistent slab avalanche occurred a few drainages to the south of Gorman Creek on a north-facing alpine slope. Similarly destructive persistent slabs are expected to remain possible to human triggering for the forecast period.

Snowpack Summary

Reactive wind slabs exist in the lee of ridges and open treeline features. Continued warm temperatures are expected to encourage settlement in the upper snowpack. A persistent weak layer of surface hoar and facets buried in early January is now typically down 40-90 cm. The layer is slowly getting harder to trigger in many areas, however, reports of whumpfing and some recent large to very large avalanches around Golden indicate this layer is still very much a concern, especially in the north of the region. In general, the lower snowpack below this layer is well settled and strong.

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